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HelpTest Code HTGR Thyroglobulin, Tumor Marker Reflex, Serum
Testing Algorithm
This test begins with the analysis of thyroglobulin antibody by immunoassay. If the thyroglobulin antibody result is negative (<1.8 IU/mL), then thyroglobulin testing will be performed by immunoassay.
If the thyroglobulin antibody result is positive (≥1.8 IU/mL), then thyroglobulin testing will be performed by mass spectrometry.
Specimen Type
Serum RedSpecimen Required
Patient Preparation: For 12 hours before specimen collection, patient should not take multivitamins or dietary supplements (eg, hair, skin, and nail supplements) containing biotin (vitamin B7).
Collection Container/Tube: Red top (serum gel/SST are not acceptable)
Submission Container/Tube: Plastic vial
Specimen Volume: 2 mL
Collection Instructions: Centrifuge and aliquot serum into a plastic vial.
Specimen Minimum Volume
1.25 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum Red | Refrigerated (preferred) | 7 days | |
| Frozen | 30 days | ||
| Ambient | 72 hours |
Reject Due To
| Gross hemolysis | Reject |
| Gross lipemia | OK |
| Gross icterus | Reject |
Reference Values
Thyroglobulin Antibody: <1.8 IU/mL
THYROGLOBULIN, TUMOR MARKER
Athyrotic: <0.1 ng/mL
Intact thyroid: ≤33 ng/mL
Day(s) Performed
Monday through Friday
Report Available
1 to 6 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
86800
84432 (if appropriate)
Reflex Tests
| Test ID | Reporting Name | Available Separately | Always Performed |
|---|---|---|---|
| HTGT | Thyroglobulin, Tumor Marker, IA, S | No | No |
| TGMS | Thyroglobulin, Mass Spec., S | Yes | No |
Method Name
Immunoenzymatic Assay
Forms
If not ordering electronically, complete, print, and send an Oncology Test Request (T729) with the specimen.